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Maybe it was because of kwin's xrender compositing or maybe it was because of prime.
(kwin opengl compositing has the problem that often it only shows a black screen for 3d using prime until you disable and reenable compositing with alt+shift+f12)

xonotic on ultra was bugged, most of the level did not render. But every other test was rendering fine.

And this dpm really needs the auto poweroff of hybrid gpus that are not used. dpm definitely seems to work as the fan goes off now and then, but then after a little while it goes on again. And while the test was running it did not go off.

As others have said, RadeonSI performance can be greatly improved either by selecting profile based power management and then setting /sys/class/drm/card0/device/power_profile to high, or by using a 3.11 kernel. Interestingly, when using a 3.11 kernel it seems like it will not be necessary to enable the new "DPM" power mangement (by adding radeon.dpm=1 to the GRUB kernel boot options) to get good performance (although of course enabling DPM will reduce power consumption and lower heat output) - I have found the following patch in the 3.11 kernel:

As others have said, RadeonSI performance can be greatly improved either by selecting profile based power management and then setting /sys/class/drm/card0/device/power_profile to high, or by using a 3.11 kernel.

HAHAHAHAHAHAHA no. Actually get a Radeon HD 7xxx and try for yourself. Performance sucks and this will not help much at all. The only thing playable is 2D indie games or old games like HL1, and even then framerate is low. If you use 3.11 kernel and mesa git, many games are currently broken.

HAHAHAHAHAHAHA no. Actually get a Radeon HD 7xxx and try for yourself. Performance sucks and this will not help much at all. The only thing playable is 2D indie games or old games like HL1, and even then framerate is low. If you use 3.11 kernel and mesa git, many games are currently broken.